How can PHP code be modified to prevent error messages like "Undefined variable"?

To prevent error messages like "Undefined variable," you can use the isset() function to check if a variable is set before using it in your code. This function will prevent PHP from throwing an error if the variable is not defined. 

// Check if the variable is set before using it
if(isset($variable)) {
    // Use the variable here
    echo $variable;
} else {
    // Handle the case where the variable is not set
    echo "Variable is not defined";
}

Keywords

PHP error handling undefined variable isset error suppression

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